In the UK under the Electricity at Work Regulations and Health and Safety at Work Act NO live working is allowed unless it has been deemed impracticable then method statements and risk assessment for safe working comes into play.
And
that is one of the typically vague sort of requirements that keeps lawyers in business. Who decides what should be deemed impractical?
I'm all for working as safely as possible, but to be honest the U.K. is getting absolutely carried away with this risk assessment stuff. Most of the bureaucrats sitting in their ivory towers making these rules also have absolutely no practical experience themselves.